match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
- const struct xt_match *match,
const void *matchinfo,
int offset,
unsigned int protoff,
info->invert, hotdrop);
}
+static int
+checkentry(const char *tablename,
+ const void *ipinfo,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ip *ip = ipinfo;
+ if (matchsize != XT_ALIGN(sizeof(struct xt_tcpmss_match_info)))
+ return 0;
+
+ /* Must specify -p tcp */
+ if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) {
+ printk("tcpmss: Only works on TCP packets\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+checkentry6(const char *tablename,
+ const void *ipinfo,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_ip6 *ip = ipinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_tcpmss_match_info)))
+ return 0;
+
+ /* Must specify -p tcp */
+ if (ip->proto != IPPROTO_TCP || (ip->invflags & XT_INV_PROTO)) {
+ printk("tcpmss: Only works on TCP packets\n");
+ return 0;
+ }
+
+ return 1;
+}
+
static struct xt_match tcpmss_match = {
.name = "tcpmss",
- .match = match,
- .matchsize = sizeof(struct xt_tcpmss_match_info),
- .proto = IPPROTO_TCP,
- .family = AF_INET,
+ .match = &match,
+ .checkentry = &checkentry,
.me = THIS_MODULE,
};
static struct xt_match tcpmss6_match = {
.name = "tcpmss",
- .match = match,
- .matchsize = sizeof(struct xt_tcpmss_match_info),
- .proto = IPPROTO_TCP,
- .family = AF_INET6,
+ .match = &match,
+ .checkentry = &checkentry6,
.me = THIS_MODULE,
};
-static int __init xt_tcpmss_init(void)
+static int __init init(void)
{
int ret;
- ret = xt_register_match(&tcpmss_match);
+ ret = xt_register_match(AF_INET, &tcpmss_match);
if (ret)
return ret;
- ret = xt_register_match(&tcpmss6_match);
+ ret = xt_register_match(AF_INET6, &tcpmss6_match);
if (ret)
- xt_unregister_match(&tcpmss_match);
+ xt_unregister_match(AF_INET, &tcpmss_match);
return ret;
}
-static void __exit xt_tcpmss_fini(void)
+static void __exit fini(void)
{
- xt_unregister_match(&tcpmss6_match);
- xt_unregister_match(&tcpmss_match);
+ xt_unregister_match(AF_INET6, &tcpmss6_match);
+ xt_unregister_match(AF_INET, &tcpmss_match);
}
-module_init(xt_tcpmss_init);
-module_exit(xt_tcpmss_fini);
+module_init(init);
+module_exit(fini);